Correcting recorded marks and land lengths taken from an optical

Details Correcting recorded marks and land lengths taken from an optical Correcting recorded marks and land lengths taken from an optical

1995-04-20

1997-03-18

Epps, Georgia Y.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 59, 360 51, G11B 509

Patent

active

056129386

ABSTRACT:
Method for correcting the length of marks and lands representing information taken from an optical disk is disclosed. The method includes digitizing amplified analog data having marks and lands played back from an optical disk and providing a data synchronization clock by using a phase lock loop (PLL). The method further includes providing an adjustment to a threshold signal level based upon the difference in timing position in mark and land edge marks with reference to the data synchronization clock and changing the data mark and land lengths with reference to the adjusted threshold signal.

REFERENCES:
patent: 4734900 (1988-03-01), Davie
patent: 5204848 (1993-04-01), Cardero et al.
patent: 5502711 (1996-03-01), Clark et al.

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